color模块新增生成随机色，生成彩虹色功能

Zframework/color.lua

@@ -1,3 +1,5 @@
+local rnd=math.random
+local sin=math.sin
 local color={
 	red={1,0,0},
 	green={0,1,0},
@@ -5,14 +7,16 @@ local color={
 	yellow={1,1,0},
 	magenta={1,0,1},
 	cyan={0,1,1},
+	purple={.5,0,1},
+	orange={1,.6,0},
 	grey={.6,.6,.6},
 
 	lRed={1,.5,.5},
 	lGreen={.5,1,.5},
 	lBlue={.6,.7,1},
-	lCyan={.5,1,1},
-	lMagenta={1,.5,1},
 	lYellow={1,1,.5},
+	lMagenta={1,.5,1},
+	lCyan={.5,1,1},
 	lPurple={.8,.4,1},
 	lOrange={1,.7,.3},
 	lGrey={.8,.8,.8},
@@ -20,19 +24,43 @@ local color={
 	dRed={.6,0,0},
 	dGreen={0,.6,0},
 	dBlue={0,0,.6},
-	dCyan={0,.6,.6},
-	dMagenta={.6,0,.6},
 	dYellow={.6,.6,0},
+	dMagenta={.6,0,.6},
+	dCyan={0,.6,.6},
 	dPurple={.3,0,.6},
 	dOrange={.6,.4,0},
 	dGrey={.3,.3,.3},
 
-	black={0,0,0},
-	orange={1,.6,0},
 	pink={1,0,.6},
 	grass={.6,1,0},
 	water={0,1,.6},
+
+	black={0,0,0},
 	white={1,1,1},
-	purple={.5,0,1},
 }
+local list_norm={"red","green","blue","yellow","magenta","cyan","purple","orange","pink","grass"}
+local len_list_norm=#list_norm
+function color.random_norm()
+	return color[list_norm[rnd(len_list_norm)]]
+end
+
+local list_bright={"lRed","lGreen","lBlue","lYellow","lMagenta","lCyan","lPurple","lOrange"}
+local len_list_bright=#list_bright
+function color.random_bright()
+	return color[list_bright[rnd(len_list_bright)]]
+end
+
+local list_dark={"dRed","dGreen","dBlue","dYellow","dMagenta","dCyan","dPurple","dOrange"}
+local len_list_dark=#list_dark
+function color.random_bright()
+	return color[list_dark[rnd(len_list_dark)]]
+end
+
+function color.rainbow(phase)
+	return
+		sin(phase)*.4+.6,
+		sin(phase+6.28/3)*.4+.6,
+		sin(phase-6.28/3)*.4+.6
+end
+
 return color